Punch and die assembly



Dec- 12, 1944. L. v. WHISTLER ETAL 2,364,834

` PUNCH AND DIE ASSEMBLY Filed Dec. l5, 1943 3 Sheets-Sheet l Dec. 12,1944. v. wHlsTLl-:R ETAL PUNCHy AND D IE ASSEMBLY Fifled Deo. l5, 1943 3Sheets-Sheet 2 Mmmm.

@6 69 ff 70 M PUNCH AND DIE ASSEMBLY Filed Dec. l5, 1945 Y 3Sheets-511691'l 3 Patented Dec. 12, 1944i V unirse stares, encreurorties.

Lawrence V.

Whistler and Sanford A. Whistler,

Kenmore, N. Y.

Application December 15, 1943, Serial No. 514,582

25 Claims. (Cl. 164-118) rother separate fastening devices requiring theforming of bolt or otherholes atfdenite points within the punch and dieretainers or mountings,

and in addition thereto the forming of holes in templates used inconjunction with such retainers or mountings. In many instances, the useof slotted or grooved retainers or mountings are used, into whichfastening bolts suited to the slots or grooves are placed and alongwhich they are moved in order to position the punches and the diesaxially to perforate a work piece at denite points, but then only in onedirection. Under all the methods now known tous employing such fasteningelements, difficulty in properly locating or pairing the punches anddies is encountered and considerable time required to set up theassembly for the purpose of operating upon a Work-piecein a mannerrpre-designed.

It is one of our objects to simplify the method of positioning' thepunch and'die elements of a perforating couple or a perforating unit soas to operate upon a workpiece in a manner predesigned without the useof extraneous fastening devices and to Ilessen the amount of setting-upwork required under present day methods.

It is also the object of our invention-to provide perorating elementswhich include .in their construction means to cause the punches'and diesforming part thereof to be located on their retainers or mountings inany desired position aiially or in any desired relation with respect toeach other when more than a single perforating element or couple is usedand to adhere to said retainers or mounting without the use ofextraneous fastening means of any kind.

It is a further object of our invention to embody in the structure ofeach of the perforatingelements or units, a magnet which forms a part ofeach element or unit and causes the latter to adhere to its associatedpunch'and/ or die retainer or mounting in yany position it may be placedthereagainst, withthe eifective perforating portions of the punch anddie in perfect alinement, so that the mere positioning of the punchanddie elements, the punch unit, or the punch and die'units, as the casemay be, on or against a retainer or mounting will assure retention ofsaid elements or units to saidretainers or mountings in any positionsthey may be placed thereon with less setting-up work. l 'Y j. i

A still further object of our invention is Lto associate templates withthev perorating devices and to provide' novel means for adjusting andirmly supporting said templatesiwithin a dies'et or other apparatuslormachine in which the work-piece is torhe operated upon.

Other objects of our invention arel to yprovide means for quickly,removing thel punch and die elements or units from theirretainers'oruholders by breaking the magneticinduction or flux between.said elements or units and their respec tive retainers or mount-ings. Aj s Our invention, therefpre,l consists in the pro'- lvision of punchand die elementsor unitsemf bodying' in theirjconstruction means tocause said elements or units toiadhere .to retainer or y mounting platesserving as supportsy for the same by the mere placement of said elementsor units thereagainst.` M f Y vThe invention further consists inproviding .a magnetic perforating element or unit which will beattractedto and maybe retainedonja metallic support or mounting, or4onrnetallicsupports or mountings, by the mere placementrof the samethereagainst, but Whichkis or4 are capable of ad-Y justmentwhilesoapplied by sliding movement of vthe unit or the elements on thesupport4 or supports in any direction toperrnit adjusting the axis of apunch with. respect to the axis of a die and/or to locate the axes ofthe punch and die with respect' to any point on the support or anypoints on the supports andthus cause a workpiece to beV perfo-ratedaccording to any predesign provided for the same upon operationv of v apress in which said support or supports' are arranged. i i f Theinvention further consists in utilizing the punches and dies inassociation with a template i or templates constructed to assureaperforation or-perforations in the Work-piece according to thepre-design of said template or templates and in providing novel meansfor adjusting and irrnly supporting said template or templates.

Our invention further consists in the novel feature of construction `andthe arrangement and combination of parts to be hereinafter described andmore particularly pointed outl in the sub"-` joined claims.

In the drawings:

rFig. 1 is a front elevation of a conventional'diev set 1n which ourimproved punch and diefassemv bly is shown in a representative manner.

die-mounting. plate Fig. 2 is a horizontal section taken on line 2 2,Fig. l.

Fig. 3 is an enlarged sectional elevation taken `on line 3 3, Fig. 2looking in the direction of Fig. '1 is a section 'taken diagonallythrough' one end of the punch holder on line 1 1, Fig. 6, showing theholder in its position of use and the manner of securing a punchtherein.

Fig. 8 is a detached perspective View of onefof the members of atemplate support. Fig. 9 is a detached perspective View of the othermember of said template support. y Fig. 10 is a longitudinal sectionthrough a dieholder in modied form; it being shown in association withits mounting plate or retainer, its template and a work-piece to beoperated upon.

use of templates for the purpose of positioning punches and dies inproper positions within a dieset is desirable, but not necessary. Whenused, the template for the punch is designated by .the numeral 23 whilethe template for the die is designated by the numeral 24 and at each endof the die-set a pair oftemplate-supports is provided foreach template.The supports for the punch template are designated by the numeral 25,while the supports for the die template are ldesignated by the numeral26. Each templateV support coml prises two sections or members 21 and28; the

Fig. 11=is a longitudinal sectional elevation of.

a further modified form of die-holder.

Fig. 12 is a sectional elevation of punch and die elements as used whendispensing with templates; said elements being shown in association withtheir mountings and a work-piece to be operated upon. Y

Fig. 13 is a sectional detail view of a part of a stripping device, suchlas we prefer to use in association with each punch. t

Reference being had to the drawings'indetail,

the numeral I5 designates a die-set considered as a whole, which may beof any conventional type. As shownit comprises a shoe I6 from which riseguide-posts I1, and a ram I8 into which said guide-posts 'slida'bly fit;the ram being provided with a shank I9 which is adapted to be insertedinto the ram-of a press, while the shoe I6 is designed to be securedin.. any approved manner to` The shoe has? slotted ears 20 at oppositeends, through which the table or bed of the press.

securing bolts threaded into the table or bedof the press are passed.Die-sets, of course, vary in size and many are` posts. Itis to beunderstood that thel die-set illustratedl is selective and .that ourimprovedy punch-and-die assembly Vmay be employed in any die-set, and onoccasions may be used directlyl ina press. Therefore, Where hereinafterreference is made to the ram of a die-set, it may be considered the`ram' or other similar element ofi a press and in referring tothe shoeof a die-set, such element may be considered asthe bed ori table of apress.

In this invention we plate may also be referred to as a punch-retaineror in any other approved manner. Resting upon Athe shoe `II of the.die-set is a By preference the necessarily of such material, nor vsotreated.

As is commonly understood in this art, the

provided with four guide` secure a punch-mounting plate 2| to theunderside of the ram I9, and this h 22, which may be referred to l as adie-retainer or mounting and it may be ses cured to the shoe in the samemanner as the punch-retainer plate is secured to the ram, or in anyother approved manner. y mounting plates 2I and 22 are hardened, or madey of hard steel or other hard metal or alloy and l they may bemagnetized, and while this is of'ad- Q vantage it is to be understoodthat they are not 'die-mounting plate 22.

wardly, as best shown in Figs. 3, 8 and 9, and y each base member 21 isprovided with a transverse groove 29 which is adapted to receive atransverse tongue 30' on its co-operating retainer or clamping member28. The inner pointed end of leach retainer or clamping member isreduced in thickness, as at 3I, see Fig. 9. When the two members of eachpunch-template support are placed in contact with each other, atemplatereceiving groove' 32 is formed between the inner ends of saidmembers intowhich` the punch template extends, and in this co-operatingrelation of the said members, securing screws 33 Ithreaded through thepointed ends of the retainer orvclamping members are tightened againstthe under side of said template. s' l The two members of each supportfor the die- `template 24 are similarly formed and co-.operate in a likemanner; correspondingparts of such members and `the means for securingthe supportr to the die-mounting plate 22 being designated by numeralscorresponding with those applied to the two members of each punchtemplatesupport. After adjusting the templates 23 and 24 laterally, orotherwise, as vmay be required, vthe securing `screws '33 are tightenedagainst the templates to guard against movementv of the latter. y

' In this invention we employ magnetic punch and die holders, designatedlrespectively by the numerals 34 and 35. ySaid holders may be'basicallyreferred to asl self-retaining or self-adhering holders, since theyinclude in their structure magnets` which serve toattract and retain theholders against ,the punch and die-mounting plates at any point at whichthey may beplaced,

brought into axial alinement with a view of forcing the operating oreffective ends of the punches properly into-their co-operating dies; or,to position the effective ends of the punches and dies axially withrespect to any point on a template, or on a mounting, when aperfor'ating device is usedv as a unit and thepunch and die` aremaintained'in axial alinement therein. n

Having reference to 'a perforating device 'in which the punch and dieare secured in separate elements of a perforating device, each punchholder comprises, in preferred form, an elongated body portion 36 havinga downwardly projecting nub or neck 31 at one end which is provided witha socket 38 extending inwardly from its lowerend a suitable distancetoreceive the inner end of a down Preferably, each punch is provided IwithaI depression il which may be annular, as shown, parti-annular, or aspot depression, as may be desired. The nulo or neck El has a collar @E2coaxial with the socket 3B, and this collar serves as a template locaterhe vnub or neck also has a tapped hole d3 formed therein into which asetscrew hl is threaded, the inner end of which is preferably reduced indiameter and unthreaded and adapted to enter the depression 4l' inthepunch for .the purpose of retaining the punch rmly in its holder.

As clearly shown in Fig. 3, the punch-template 23 is prefabricated tomeet the requirements for the punching of the metallic sheet orWork-piece, and with this viert1 it is provided With pilot openings d5into which the locating collars l2 formed on the punch-holders extend.The punches have their inner ends entered in the sockets Sil of thepunch holder and each punch has a stripper-device 13?; secured theretoWhich comprises a comparatively thick header lil secured to the punch bymeans of a set-screw lili, a-shoe into which the operating end of thepunch slidably extends and guide-pins ed secured into said shoe atthefour corners thereof and guided )Tor movement in guide openings 5l inthe header' lll.l Said guide-pins have heads S2 at their upper endsmovable in enlargements of the several guide openings in said header inwhich said guide-pins are slidably arranged and said heads normally'engage shoulders 53 formed in said guide openings to prevent undueexpansion of spiral springs 5d which surround said guide-pins. type arenonT in common use, and since they form no part of this invention theyneed not be further described, except to state'that when the spiralsprings are expanded tothe limit permitted by the heads of theguide-pins, the operatingv ends of the punches are iiush lwith theunderside of the shoes de, or substantially sol In the particularassembly illustrated in the drawings.y each die-holder S5 comprises anelongated body portion 55 having a long upwardlyextending n ub or neckat one end thereof. This nub or neck is socketedrfrom its upper end'ardly, as at 5l, and it has a laterally opening slug-discharge t3separated from said socket oy an intervening Wall Q providedwith anopening which places the socket Elin communication with theslug-discharge vpassage 5S. The socket 5l be termed adie-receivingsocket and i opera with a punch of the type described.

Since each die-holder is paired. Witha punchholder in the particularapplication of our invention illustrated, the axes of the hubs or necks3'! of the punch-holder are vertical alinement with the axes of the nubeor necks 5t of the dieholders and the die-template 2li is provided withopenings through which the dies iii extend; said dies projectingupwardly fromy the body por- Stripper devices of this it is fitted adie5l designed for matingI Sil entered in openings in the die-template,they ais@ serve as pilots. f

From the foregoing it will be apparent that the punches and dies are tohave their-axesl in alineinent and that although the .perforations to bepunched in the Work-piece may Vary in size from the'die-'receivingopenings in the die-template 'and the vpi'lnch-receiving opening in thepunchtemplate,the axes oi these two last-mentioned openings determinethe locations of the axes o the holes to be punched in the Work-piece.Our seit-adhering punch and die-holders are,

Iin preferred form, made channel shaped in rcross section from thenub orneck ends thereof to a point in close proximity to the opposite ends oftheir bodyv portions, andl inthe channel A64 jso formed, magnetsf areplaced; spaced -from the material forming thev body portion of theholder by air-gaps 65, such 'as shown in Figs. 4, 5 and 6. rEhe magnetis of a thickness somewhat less than the depth of the channel in Whichit is placed and' it is fastened in place by an elongated retainermemberEl also entered in the channel-like body portion. Securing screws liareypassed through the inner Wall or" the chan'- nel and the magnet andinto the retainer member el, as best shown in Fig. 5. Thesesecuringscrews are formed of brass or other non-magnetic matelrial sothat'no portion of the magnetic force or energy of the magnet isconveyed to the holder proper. `f

The air-gaps between the side and end Walls of thel channels and themagnets'may be filled with non-magnetic material so that the holder isfully insulated from the magnet. The magnets, in each instance, arepreferably flush with the edges ci the confining 4Walls' 'of the channels'o that when placing these holders against the upper Surface of thedie-mounting plate and/oi" the lower surface of the punch-mountingplate, the magnetic iux or force passing across the air or insulationgaps Will attract the holders to the mounting plates Vandretain them inany desired gated and conform substantially to theoutline4 of-v themagnets provided on their contact `iaes with a slight elongateddepression 69 extending from end to end thereof, thus providingelongated contact regions 'it along the full length thereof and atopposite sides oi' said elongated depression.

Any other manner of securing the magnets to the holders may be provided,so -long as provision is made for non-magnetically insulating Saidmagnets from the holder so that no portion of tions the diehclders adistance slightly greater the material of Said holder, the punch, orother parts in Contact therevlithfbecome magnetized,

The punch and dieholders are orf-like construction, but the nubs ornecks of the die-holdersv are usually of greater length than those' ofthe punchholders in order to accommodate the dies ill and to providespace for the slug-discharge passages' 53. The dies are securrtinpl'ac'e vby s'et screws il, as bestv shown inrFig. l0. AThese setscrews may-'oe located at onev ci the corners of the niibs or necks ofthe die-holders, or they may be placed at any other points ofthe necks;for example, at oneside of the neck, as'shown in Fig. 10.

tvs-msn to stress the point that while themagfy The magnet is and thedie-receiving holes 62 in the die-template.

The templates 23 and 24 and their respective supports may be dispensedwith and in such cases pilot holes 12 are 4drilledin the mountings 2|and 22, in the same manner in which the holes 45 and 62 are drilledthrough the templates 23'and 2-4, so as to assure axial alinement ofthese holes when the mountings are associated with modiiied forms ofpunch and die-holders, as clearly shown netic force between the holderand mounting and permit the holder to be removed.

Inl Fig. 11 we show a modified form of release device for the holder andin this instance a screw bolt 11 is passed through the holder at itsouter end, outside of the area in which the magnet is located. Normallythis screw bolt has its end out of contact with the surface ofthemountingv on which theholder is magnetically retained and by tighteningthis screw, the holder will be lifted from the surface of the mountingso that it can be easily removed therefrom.

kAs hereinbefore stated, the construction of the holders may be variedand the magnets thereof in Fig. 1,2. The punch and die holders are thereshown provided with pilot pins or studs 13 which extend outwardly beyondthe bearing faces of the holders and these pilot pins or studs areentered in the holes 'l2 in the mountings. The pilot pins are, ofcourse, co-axial with the punches 39 and the punch-hole openings in thedies 6|. In such cases, the punch and die-holders are rotatably movableunder .force while attracted to the mountings, the pilot pins serving ascenters on which the mountings may swing, but such movement oradjustment does not in any manner permit variation in the axialpositionof the punches and dies and the only advantage lies in the fact that theextensionsA or elongated body portions may be swung to positions thatwill not interfere applied in any approved manner, examples of variationbeing illustrated'in Figs. 10 and 11 wherein we illustrate anon-magneticcontact toe or fulcrum element 18 which may be formed of brass or othernon-magnetic material and which may be applied to each holder,regardless of its construction. In such cases, when actuating therelease device, such asv shown at 14 or Tl, theholder will lbe fulcrumedon this non-magneticrv t contact-toe and an immediate. release assuredwhen the opposite end*v of the device is lifted slightly from themounting. Such contact-toe may also be used where no release device ispro- Y vided, since a thin blade or other similar object may be forcedbetween the holder and its mounting at the end opposite thecontact-toe'and quick release of the holder be assured.

Our' improved self-retaining holders may be utilized in various forms,whether used as couples or in a form in which both the punch and die isi', embodied in a single structure; and it is further to be understoodthat it is not our intention to with the extensions or body portions ofother l punch and die-holders used in the assembly.

As is now the practice in preparing a punch and die assembly forperforating a work-piece, such as the sheet of metal shown in thedrawings, the perforations in the work-piece are to have their centersin axial alinement with the centers of the punch-receiving openings andthe die-receivingopenings '62 in the templates 23 and 24, re-

spectively. These templatesv may be adjusted longitudinally and/ortransversely, or obliquely, by adjusting the same within thetemplate-receiving grooves v32 formed in the` template supports 25 and26, and when adjusted to the de- 'sired positions, the set screws 33will V positively retain the templates in position after tightening saidscrews.

Any permanent magnet may -be employed for the' purpose of thisinvention, but we preferably employ what are commercially known asSintered-Alnico magnets, which may be cast or otherwise shaped toconform to the channels in the punch and die holders, which are, ofcourse,` varied in size and shape, as required. Each punch anddie-holder may be provided with releasing means to overcome the magneticforce of its magnet and thus disengage the holders fromtheir mountings.In Fig. 10 we have shown a lever 'I4 provided with a parti-circularinner end 'l5 eccentrically mounted on a pivot pin 16 to create acam-like contact member normally out of con-` tact with the mounting andhaving its lever eX- tending therefrom to serve as a handle. Uponswinging the lever or handle outwardly and downwardly from the positionshown in Fig. 10, the throw of the cam-like lowerend forcibly engagesthe surface of the mounting and thus lifts the holder from said surfaceso as to break the mag` limit the invention to perforating-devices,since it may be embodied in punches and dies employed forblank-stamping, forming, or other purposes. Therefore, where in theclaims the term punch and die assembly is employed it is to beconsidered basically so as to include the male and female elements ofstamping devices, which may be referred to as punch and die,respectively, as well as those of perforating devices.

Itis not unusual-to require stamped parts with a great manyperforations, particularly in .air--l plane work, and oftentimes theseperforations differ in size. In the stamping of parts, lighteningopenings are also required in addition to perforations. On occasions,several thousand or any other denite number of these stampings arerequired with the perforations in a definite relation to each other andto the lightening openings. It however is not unusual to requiremodifications for such stampings in which changes in the relationship ofsome of they perforations must be y made, spacing varied, or some largeror smaller perforations are required. This may occur several times, yetymost ofthe perforations and the lightening openings will have theirrelative positions changed. In vsuch cases it may be found necessary tochange only a comparatively -small number of punches anddies forstamping the modified structures.v Consequently, such punches and diesas are known to be 4retained in unchanged positions may be fastened inplace on their retainers or mountings by means of bolts in the usualvmanner and such as will require change in positions maybe used inaccordance with this invention. This would permit the changes to be madequicklyvand easily without the need of tools for attaching or detachingthe punches and dies.

Naturally we prefer, yeven under' such conditions, to utilize punchesand dies embodying the principle of our invention throughout the entirepunch and die assembly.

We also Wish to stress the fact that in this invention, no electriccurrent o-r electric-conducting Wires are requiredwhich however is thecase When electro-magnets are employed and current applied to individualpunches and dies could not beused because of the current-conductingWires, which would at least vequal in number the punches and dies usedand would by reason of occupying the stamping space in a die-set,interfere vvith the stamping or perforating operations,

Having thus described our invention whatwe claim is:

1, In a punch and Vdie assembly, a pair of mounting plates spaced apart,a punch-holder self-adhering to one of said mounting plates'and havinga. punch, and a die-holder self-adhering to the other of said mountingplates and having a die for co-action with said punch, said punch anddie-holders being adjustable on said mounting plate to enable the punchand die of said holders to be axially alined.

2. In a punch and die assembly, a pair of spaced apart mountings, apunch-holder having apunch anda magnet attracting said punch-holder toone of said mountings and retaining said punchholder thereon, adie-holder having a die and a magnet attracting said die-holder to theother of said mountings and retaining said die holder thereon, saidhol-ders being adjustable on said plates while magnetically retainedthereon to position the punch and die of said holders in axialalinement. j

3. In a punch and die assembly, a pair of mountings spaced apart, apunch-holder having a punch-receiving portion and a magnet attractingsaid punch-holder to one of said mountings and retaining said holderthereon, a die-holder having a die-receiving portion and a magnetattracting said holder to the other of said mountings and retaining saiddie-holder thereon, and means -for non-magnetically insulating thepunch-'receiving portion of the punch-holder and the die-receivingportion of the die-holder from said magnets.

4.-. In a punch and die-assembly, a punch-holder having a punch andbeing adapted to be placed in contact with a metallic support, and adie-holder having a die and being/adapted to be placed in contact with ametallic support, Vsaid punchholder and die-holder embodying in theirconstruction means to cause the said holders to adhere to said supportsby mere contact therewith.

5. In a punch and die assembly, two spacedapart mounting-plates, punchand die-holders embodying in their construction permanent magnetsserving to cause said holders to adhere to said mounting-plates, saidpunch-holder having a punch secure-d thereto and said die-holder havinga die applied thereto, said punch and dieholders being 'adjustable onsaid mounting-plates under sliding movement thereon to enable the punchand dies thereof to be axially alined While magnetically attracted tosaid plates. f

6. In a punch and die assembly, two spaced-A apart mounting elementspresenting contact surfaces for punch and die-holders, a punch-memberhaving a punch, ache-member having a die-opening to receive theoperating end of said punch, a permanent magnet built into saidpunch-holder and serving to cause the latter to adhere to one of saidmounting elements, a permanent magnet built into said die-holder andserving to cause the latter to adhere to the other of said mountingelements, and release means carried by said punch andQde-holders for.releasingt` said holders `from said contact surfaces.. f y e T In apunch and/die `,as`sembly, tWo spacedapart' mounting elements presentingcontact surf' faces for punch and die-holders, a punch-holder havingapunch, a die-holder having-adie-opening to receive the operating end ofsaid punch, said punch-holder having'an elongated body p0rtion and apunch-receiving portion at one end thereof in which said punch isremovably secured, said die-holder having an elongated body portion and-a die-portion at one end thereof in Which said die-opening is arranged,a permanent magnet carrie-d by the elongated body portion of each ofsaid holders, serving to cause the latter to magnetically adhere'to itsassociated mountingelement, -means for non-magnetically in'sulatllersaid magnets from' said punch and from saiddieportion, and arelease-screw threadedinto one end of each of said elongated bodyportions and adapted to lift the latter from said Contact surfaces torelease the punch and die-holders therefrom. l j

8. In a punch and die assembly, two spacedapart mounting e'elernentspresenting contact surfaces for punch 'and die-holders, a punch-holderhaving a punch, a die-holder having a die-opening to receive theoperating end o f saidpunch, said punch-holder having anelongated bodyportion and a punch-receiving portion at one end thereof in which saidpunch is removably secured,

said die-holder having an elongated body portion and a die-portion atone end thereof in which said die-opening is arrangede permanent magnetiitted into the elongated body portion of each of said holders, and acam-device pivotally connected to the opposite end of each of saidholders for releasing said holders 'from said contact surfaces.

9. In a punch and die assembly, vtvvo spacedapart mounting elementspresenting Contact surfaces for punch and die-holders, a punch-hol-derhaving a punch', a vdie-holder having a die-opening to receive theoperating Vend of said. punch,

y said punch-holder having an elongatedbody portion and apunch-receiving portion at one end thereof in which said punch isremovably secured,

sai-d dieholder having anelongated body portion and a die-portion at oneend thereof in which said die-opening is' arranged, permanent magnetstted into the elongated body portions of said holders andnon-magnetically insulated therefrom, said magnets servingto cause saidholders to adhere to said contactsurfaces, release-means at one endl ofeach of sai-d elongated body portions for lifting the latter out ofcontact from thecontact surface to which it adheres, and a non-.magneticelement at the opposite end of each of said holders normally incontac'tvvith said contact` surface and serving as 'a ulcrum on whichsaid holders swing When the opposite ends thereoffare lifted from saidContact surfaces by said releasemeans. f

10.` Ina punch and dieassembly, superimposed 4 spaced-apart punch anddie-mounting plates, punch-template supports secured to the underside ofthe upper mounting plate at opposite ends thereof, die-template supportssecured to the upper side ofthe lower mounting plate at opposite endsrthereof,y a' punch template provided with pilot openings centered to theholes to be stampedA in` a work-piece `and being adjustable Vini-saidpunch-template supports, a die templateprovided` I upper member adaptedto be rigidly mounted on said ram and means to cause Asaid shoe andupper with pilot-openings alsocentered to the holes to` be stamped insaid work-piece and being adjust` able in saidv die-templatesupports,self-adhering punch-holders applied to the underside'of the said uppermounting plate and having punches eX- t'ending axially through thepilot-openings in said punch template, self-adhering die-holders -havingdies extending through the pilot-openings in said` die template andadapted to have the work-piece l to be punched rest thereon, said punchand dieholders being slidable on said mounting .plates while adheringthereto for adjusting the same toA the pilot-openings in said punch anddie templates, and stripping means associated with said punches.

l1. In a punch and die assembly for use in a press having a stationarybed and a reciprocating l ram, comprising a die-setl having a lower shoeadaptedto be rigidly mounted on said bed, an

member to operate in alinement,l a pair of plates detachably mounted,lone against the underside of said upper member and the other upon saidshoe, a plurality of punch anddie implements,

L each including magneticmeans to cause them to be attracted to saidplates, said punchrand die 1 implements being adjustable over theopposing surfaces of said plates while magnetically attracted thereto toenable the punches of said punch 12. A punch and die assembly for use ina press by said ram, means to cause said upper member and shoe tooperate in alinement, mounting plates secured to said upper member andtosaid shoe, f

a plurality of punch and die implements ladapted to act on the Work,each implement having a laterally-directed extension provided with amagl net adapted to cause said implements to adhere l to their mountingplates, yet allow correct positioning of said implements on said vplatesywith ments .in axial alinement.

I magnetic means embodied in the construction of l implements and thedies of said die implements to be axially alined.

the co-acting parts of said punch and die imple- 13.- A vpunch and dieassembly including a pair Y of spaced-apart plates adapted to be mountedon two relatively movable members of a press or die- 3 set, templatesupports secured to each of said plates, templates adjustably secured tosaid sup- 1 ports in spaced relation to each other and to said platesand having a plurality of axially-alined positioning holes therein, anda plurality of pairs of punch implements and die implements having partsfitting within said holes in said plates and 1each implement includingin its structure means `for retaining the same against its co-operating`plateby the mere placement of said implement thereagainst, said punchimplements and die implements having punches and dies, respectively,

axially alined and being adjustable on said plates l `by slidingmovementthereon in any direction.

14. In a punch and die assembly, two co-o'perating members normallyspaced apart and arranged 'for movement toward and rfromV each other, adie member self-retained by the mere` `placement thereof against one ofsaid members, `and a punch adapted for co-action with said die memberfor operating upon a work-piece. 15. In a punch and die assembly, twoco-oper- Vating members normally spaced apart and arranged for movementVtoward and from each other, a die member having as part of itsstructurea permanent magnet whereby said die member is caused to adhere to one ofsaid co-operating members, and a punch' adapted for co-action with saiddie member upon a work-piece.

16. In a punch and die assembly, two co-oper'- ating members normallyspaced apart and arranged for movement toward and from eachl other,means for perforating a sheet Yo1 metal or other sheet materialcomprising a punch,v a `die for co-action with said punch, means forholding said die in axial alinement with said punch, and

movably secured to said holder.

18. In a punch' and die assembly, av die-holder including a permanentmagnet adapted to cause said holder to be self-retained against ametallic member of a die-set or-press under contact of said holdertherewith, said holderhaving a dieopening adapted to receive a punchupon a work-piece.

19. In a punch and die assembly, aperforating device comprising twounits, one a punch and the other'a die, magnetic means embodied in theconstruction of said units to cause said device to adhere to materialforming part of a press or die-set by the mere placement of said devicethereagainst.

20. Ina perforating device', a hollow elongated body portion having apunch ordie at one end thereof and av magnet'located in the hollow ofsaid body portion, said magnet being non-magnetically insulated from thepunch or die forming part of said perforating device and causing saidbody portiony to be attracted t0 a metallic part of a die-set or pressso as to be retained thereagainst while permitting adjustment of saidbody portion by sliding movement over the surface of said metal. y

21. In a perforating device or the like, a perforating unit having twometallic parts, and a -permanent magnet in contact ywith said parts,`said parts 'being otherwise spaced apart and serving as oppositemagnetic poles. Y Y 22. In a perforating device orthe like, an operatingunit having two magnetic metallic parts and a magnet between and incontact with said parts, said parts being otherwise separatednonmagnetically and both parts being'adapted for Contact with a metallicsupport, the so separated portions kof said parts serving asoppositemagnetic poles, respectively. j H

23. In a perforating device or the like, an operating kunit comprising ahollow part having a` `and, whose edges are non-magneticallyY spacedfrom said surrounding walls, the fouterface of said metallic elementandthe edges of said surrounding walls lying in the sameplane, andserving as opposite magnetic poles.'

for operating 24. In a perforating device or the like, an operating unithaving a body comprising a permanent magnet and two metallic partsspaced apart by said magnet and between which said magnet is secured,said metallic parts beingy otherwise nonmagnetically spaced from eachother, the nonmagneticallyspaced-apart portions of said metallic partshaving contact surfaces in the same plane serving as opposite magneticpoles and said body also including a part for operating on a work-piece.

25. In a punch and die assembly, a metallic support, an operating unithaving a metallic body apart regions in the same plane for contact withsaid metallic support, said metallic body having also a part foroperating on a work-piece and said spaced-apart regions thereof servingas opposite magnetic poles to cause said body to be attracted 10 to saidsupport.

LAWRENCE V. WHISTLER. SANFORD A. WHISTLER.

